In the near future, much of the world has been forgotten at the bottom of the ocean due to rising sea levels. Natsuki Ikaruga, who lives in a small town surrounded and stranded by the sea, is invited by a mysterious woman, Catherine, to search for a treasure in his grandmother's house who was a marine geologist. One day, he dives to the bottom of the ocean in a submarine and encounters a mysterious capsule with a girl sleeping inside. The girl was a humanoid so sophisticated that she could be mistaken for a human.
Will this thing really be okay?
هل سيكون هذا الشّيء بخير حقّاً؟
Meinst du, das geht wirklich gut?
¿De verdad es seguro?
¿De verdad es seguro?
Le sous-marin va vraiment tenir ?
Dici che se la caverà sul serio?
Será que vai mesmo aguentar?
Думаете, ничего не случится?